FABRICATION METHOD OF CATALYST-CARRIER COMPOSITE POWDER

摘要

Provided is a preparation method for a composite powder consisting of a noble metal catalyst and a carrier, which can prevent deterioration in the activity of a noble metal catalyst such as platinum used for an exhaust gas purifier, etc. due to the agglomeration and coarsening of metal at a high temperature, and which can reduce the use of a high-priced catalyst being unnecessarily used, by uniformly dispersing a catalyst only on the surface of a carrier. The composite powder consisting of a noble metal catalyst and a carrier is obtained by: dissolving a precursor substance, which constitutes a noble metal catalyst particle, in a solvent to prepare a precursor solution (S10); dispersing constituents of a carrier in the precursor solution (S20) to prepare a colloidal solution (S30); spray pyrolyzing the colloidal solution to prepare a composite powder (S40); and collecting the composite powder through a filter (S50). A dispersing agent can be further added in the preparation of the colloidal solution so as to disperse the constituents of the carrier in the precursor solution in a desired composition ratio for preparing a stabilized colloid. [Reference numerals] (AA) Dispersant; (S10) Prepare a precursor solution for a noble metal catalyst; (S20) Disperse constituents of a carrier in the precursor solution; (S30) Prepare a colloidal solution; (S40) Spray pyrolyze the colloidal solution; (S50) Collect composite powder